The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2016.08.08.16.31.53 kre src/usr.sbin/npf/npftest/Makefile,v 1.10 2016.08.08.16.40.39 kre src/sys/net/if_tap.c,v 1.90 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2016.08.html#2016.08.08.16.40.39